1 files changed, 9 insertions, 2 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index cda30ea354a2..149a415d1e0a 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -122,7 +122,13 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
 #endif
 #define TCP_RTO_MAX     ((unsigned)(120*HZ))
 #define TCP_RTO_MIN     ((unsigned)(HZ/5))
-#define TCP_TIMEOUT_INIT ((unsigned)(3*HZ))     /* RFC 1122 initial RTO value   */
+#define TCP_TIMEOUT_INIT ((unsigned)(1*HZ))     /* RFC2988bis initial RTO value */
+#define TCP_TIMEOUT_FALLBACK ((unsigned)(3*HZ)) /* RFC 1122 initial RTO value, now
+                                                 * used as a fallback RTO for the
+                                                 * initial data transmission if no
+                                                 * valid RTT sample has been acquired,
+                                                 * most likely due to retrans in 3WHS.
+                                                 */
 
 #define TCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ/2U)) /* Maximal interval between probes
                                                          * for local resources.
@@ -295,7 +301,7 @@ static inline void tcp_synq_overflow(struct sock *sk)
 static inline int tcp_synq_no_recent_overflow(const struct sock *sk)
 {
         unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp;
-        return time_after(jiffies, last_overflow + TCP_TIMEOUT_INIT);
+        return time_after(jiffies, last_overflow + TCP_TIMEOUT_FALLBACK);
 }
 
 extern struct proto tcp_prot;
@@ -508,6 +514,7 @@ extern void tcp_initialize_rcv_mss(struct sock *sk);
 extern int tcp_mtu_to_mss(struct sock *sk, int pmtu);
 extern int tcp_mss_to_mtu(struct sock *sk, int mss);
 extern void tcp_mtup_init(struct sock *sk);
+extern void tcp_valid_rtt_meas(struct sock *sk, u32 seq_rtt);
 
 static inline void tcp_bound_rto(const struct sock *sk)
 {